Despite a rocky history of court cases, lost patents and further challenges, Viagra has enjoyed increasing popularity over the years. The drug’s name is synonymous with impotence treatment and the phrase "little blue pill" is instantly recognized by most American adults. It consistently outsells its competitors, Cialis and Levitra, and has even been used in conjunction with other illegal drugs such as ecstasy to create a new recreational sex drug.

Introduced in 1998, Viagra was originally tested as a treatment for high blood pressure and angina, a heart disease. While it proved to be fairly ineffective at treating either disorder, scientists discovered that the drug drastically enhanced penile arousal and it was decided that it would be marketed as a treatment for erectile dysfunction. The decision was a successful one, with Viagra bringing in over one billion dollars in just three years.

The drug works by releasing nitrous oxide which allows for the relaxation of the smooth muscles penis, enhancing the flow of blood to the penis. While this does help create a lasting erection, Viagra only works in conjunction with sexual stimulation. It enhances the body’s natural ability to become aroused.

Pfizer’s Viagra patent expires in 2014, when the whole patent situation will no doubt be revisited, but until then, the pharmaceutical company should be able to defend its position as sole producer of this valuable treatment for erectile dysfunction. Viagra continues to enjoy rampant popularity and will most likely continue to do so until the patent expires in less than a decade.

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